This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 112 |
| 3 | 5868 |
| 4 | 250128 |
| 5 | 10020912 |
| 6 | 399379728 |
| 7 | 16255733440 |
| 8 | 684615750832 |
| 9 | 30031767680256 |
| 10 | 1376568893633760 |
| 11 | 66017645596167168 |
| 12 | 3313241694194681184 |
| 13 | 173934275433107845120 |
| 14 | 9543378596912872361440 |
| 15 | 546711252967087466397696 |
| 16 | 32663132242303127521217184 |